International Scientific Journals
of Scientific Technical Union of Mechanical Engineering "Industry 4.0"

Тhe widespread use of hydro power plants is well known. In addition to such plants that have been in operation for decades, there is currently an increased interest in the design and construction of new plants. In this regard, the accumulation of statistical data on the change in certain quantities and parameters for different periods of time and operating modes is important. On the other hand, subsequent processing of such accumulated data according to certain rules is possible. The main goal of this paper is statistical processing of data for a specific hydro power plant, in order to identify certain trends and prepare recommendations for improving activities.

The paper presents an innovative method for joining Al alloy sheets and polymer fibre-reinforced composites by thermal drilling. A proposal for modifying the joint geometry by reverse drilling with a larger diameter tool is presented. The proposed modification demonstrated a statistically significant increase in the failure energy of the resulting joints.

The contribution is focused on the analysis of the roughness of metal surfaces after applying a conversion layer using phosphating. The types of basic materials is used in the experiment hot-dip galvanized microalloyed steel HX340LAD+Z. During the application of the conversion layer, changes in surface roughness were studied with respect to the phosphating time, which was 3, 5 and 10 minutes. The paper deals with the evaluation of the relationship between the individual roughnesses parameters of pre-treated surfaces using correlation analysis. Based on the measured roughness values on the surfaces, the standard of statistical significance of the correlation between the observed parameters was determined from them. The achieved results provide information for other technological operations such as the creation of adhesive joints, where the correct anchoring of the adhesive is important for load bearing capacity of joints.

The article is focused on the research of the influence of different blasting means on the surface of the titanium alloy Ti6Al4V, which was made by the sintering technology of layered metal powders (DMLS) in terms of microgeometry. The resulting microgeometry values of the titanium alloy placed on the platform in different sectors. Individual sectors had different laser power settings. The blasting was carried out at a constant pressure of 6 bar. Samples were then subjected to roughness measurement by contact method in accordance with STN EN ISO 4287. Individual parameters were subsequently statistically evaluated. A 3D topography of roughness of individual blasted materials was made.

In the paper are presented the main theoretical techniques used for the modeling and simulation of industrial processes. The main focus is on the physical side of the theoretical techniques and their mathematical side is reduced to a reasonable minimum. Different theoretical approximations as thermodynamic and hydrodynamic levels are used.

In the paper are presented the main theoretical techniques used for the modeling and simulation of industrial processes. The main focus is on the physical side of the theoretical techniques and their mathematical side is reduced to a reasonable minimum. Different theoretical approximations as thermodynamic and hydrodynamic levels are used.

In this paper I present a research based on technological problem encountered in the machining parts specific aerospace industry made from aluminum alloy extruded profile with length up to 6 meters. Those parts have very tight tolerances, during milling process appear several factors that influence the repeatability of machining processes.

Direct Metal Laser Sintering1 (DMLS) is a revolutionary technology that allows a production of fully functional metal parts directly from a 3D CAD data, eliminating the investment to production tools and technologies which brings considerable cost and time savings. Metal parts made by DMLS technology are fully comparable with casted or machined parts. A range of application of DMLS technologies is very wide – from prototypes, through short-run production to final products. Advantages of DMLS technology are arising along with complexity of parts – more complex geometry of parts (in terms of shape and occurrence of the detail) make DMLS technology even more economically effective.